Questions: Relationships

boyfriend and I been together 4 years. No infidelity from what I’ve known. Always had access to his phone to enlist trust but now it’s a habit to go through his phone when I see him which in return pisses him off. His old phone broke, so he is using his old work phone which is an iPhone, got a privacy screen protector (which he had on his past iPhone a while back) and a new passcode. This was unsettling for me so I went ahead and got the new passcode for his phone and looked through it. He’s keeping it simple with not too many apps as I believe he plans to go back to his old phone eventually. I always peer closer to look at his phone when he’s on it so I can avoid the privacy screen protector, although I get the sense he doesn’t like that all the time. He said it annoys him when I question him a lot. For example, he told me his coworkers went to a seafood buffet after work, I asked where and how much the food was and he couldn’t recall and I questioned more which he was not fond of. Am I being too much or my feelings valid?